Shoe construction for rubbing machines



Aug. 7, 1951 P. T. TRloLo SHOE CONSTRUCTION FOR RUBBINC MACHINES 2 Sheets-Sheet 1 Filed July 14. 1950 Qwlmlllu L I INVEN'NOR. l 717.7 f Twl,

Aug. 7, 1951 Filed July 14, 1950 P. T. TRIOLO SHOE CONSTRUCTION FOR RUBBING MACHINES INVENTOR.

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Patented Aug. 7, 1951 SHOE CONSTRUCTION FOR RUBBING,

` MACHINES Peter T. Triolo, Rockford, Ill., assignor to Sundstrand Machine Tool Co., a corporation of Illinois Application July 14, 195o, serial No. 173,798

` Claims.

This invention relates ytoy rubbing machines, and more particularly to a demountable rubbing shoe for use with a reciprocatory rubbing machine.

It isthe general object of this invention to provide a new and improved demountable shoe Vfor use with a rubbing machine.

I [t is a more specific object of this invention to produce a demountable shoe for use with a rubbing machine having a reciprocatory member such as the rubbing machine shown in the application of Peter T. Trolo and Ray W. Erickson led on March 1, 1950, as'Serial No. 147,638.

It is a further object of thisA invention to produce a demountable shoe for use with a rubbing able locking means to permit the members to be firmly locked together during operation of the machine and yet to permit the shoe member to be removed from the reciprocatory member by a 'simple rapid operation.

Another object of the invention is to produce ,a demountable shoe which is substantially rectangular in shape and is provided adjacent one Vend with a pair of upstanding lugs adapted to `be received in complementary slots in a reciprocatory member, each of which lugs is provided with a wcdging face facing the other end of the shoe, there being a dovetail recess at the other end `of the shoe adapted to receive a complementary dovetail on the member, and to provide such a -machine with clamping means to clamp the shoe 'against the member whereby the wedging faces i of the lugs force the dovetail into the recess, thus producing a rm union between the member 'and the shoe and yet one which may be readily released by releasing the clamping means.

Other and further objects of the invention will .be readily apparent from the following description and drawings, in which:

Fig. 1 is a side elevation of the lower portion of y a rubbing machine embodying the invention partially broken away to various depths more clearly to illustrate the invention;

I Fig. 2 is a side elevation'of the left-hand porftion of the apparatus shown in Fig. 1 and showing the relative positions of the machine and the Imachine of the type described in the preceding paragraphs which may be quickly and easily demountable shoe of this invention during the separating or engaging operation;

Fig. 3 is an elevational view of the left-hand end of Fig; 1;

Fig. 4 is a view of the botom of the reciprocatory member, and

Fig, 5 is a plan view of the top of the demountable shoe, Figs. 4 and 5 being so arranged as to position'the reciprocatory member and the demountable shoe so that rotation of the shoe about its longitudinal axis will place it in position to be attached to the bottom of the reciprocatory member.

While the invention is susceptible of embodiment in many different forms, there is shown in the drawings and described in detail one specific embodiment, with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to the embodiment illustrated. The scope of the inven- 4 tion will be pointed out-in the appended claims.

When using rubbingrmachnes equipped with 'an abrasive material, such as sandpaper, it is clear that such material will wear in a comparatively short period of time, whereupon the removal of the worn out material and the fitting and insertion of new paper become necessary.

This operation canbe a time-consuming o ne. 'With the shoe of this invention it is possible for the workman to use a number of shoes to which sheets of abrasive have previously been attached. When the abrasive becomes worn on any one shoe,A it is merely necessary to flip the clamping handle onthe machine whereupon the shoe presently in use will drop off. It is then but a matter of moments to slip a new shoe in place, flip the clamping means and the workman is ready to continue with his Work. When the rubbing machine is used in filing operations, le sections may be secured to the bottom of the shoes, with Ydifferent shoes carrying file sections of different neness, and changes in shoes may be made in a like manner. Thus it is possible to effect a considerable time saving by the use of Vreadily demountable shoes. According to this invention, there is produced a demountable shoe which can readily be removed and replaced with a shoe of similar construction in a much shorter space of time than is necessary to replace the abrasive material itself.

For the purpose of exemplary disclosure, the

described as employed with a rubbing machine channel members 25.

atoaevi of the general type disclosed in the aforementioned application of Peter T. Triolo and Ray W. -Erickson. As shown in that application, the rubbing machine comprises a hollow body member 25, to the lower portion of which a reciprocatory member` 2l is attached and adapted to be driven by an air motor enclosed in the body member.

As contrasted with the apparatus shown in the above mentioned pending application, the reciprocatory member illustrated in the drawings does not carry the rubbing material but is so formed as to receive a demountable shoe member 22 which may be provided with a rubber pad 23 to provide a resilient backing for a sheet of abrasive material 24 held to the shoe member 22 by the clamping means 25 provided at each end of the shoe.

As best seen in Figs. l and 3, the body is provided with a channel member 26 having inturned bottom flanges 21 extending along each side of the body and on which wheels 28 mounted on the reciprocatory member 2| may roll. The reciprocatory member is provided with flange portions v29 which underlie the flanges 21 more securely to hold the reciprocatory member in position.

As best seen in Fig. 4 a drive shaft 30 is rotatably mounted in the body member and adapted `to be driven by a motor enclosed therein. Se-

cured to the drive member are a pair of oppositely facing eccentrics 3l and 32. A connecting rod 33 is secured to the eccentric 3l and is attached to a counterweight 34 slidably mounted in the A second connecting rod 35 is secured to the eccentric 32 and to the reciprocatory member to reciprocate the member.

In order to provide for the attachment of the shoe member 22 to the reciprocatory member,

the latter is provided with a pair of slots 35 and catory member 2l there is provided a fitting in the form of a dovetail 42 which extends arcuately ,outwardly from the member 2|.

Referring now to Fig. 5, the shoe 22 comprises a flat plate 44, generally rectangular in shape, .at one end of which there is provided a pair of parallelogram-shaped upstanding lugs 45 and 46. The lugs are substantially complementary in shape to the slots 36 and 31 and the faces 41 and 48 of each of the lugs facing the other end of the shoe are wedge shaped. If desired, the sides of 'the slots 36 and 31 against which the -wedge surfaces 41 and 48 are to bear may also be wedge shaped, although it has been found that this is generally not necessary. It will be noted that the sides 41 and 48, and the sides 41a and 48a opposite thereto on each lug extend diagonally outwardly relative to the axis of reciprocation of the shoe. A plate 50 is located at `the other end of the shoe and rmly secured thereto. The plate is provided with an arcuate edge l matching the edge of the dovetail 42 and also with an undercut portion 52 complementary -to a wedge portion 53 formed along the edge .E of the dovetail.

A pair of spaced brackets 55 and 56 are secured of thev reciprocatory member.

to the plate 44 at the lug carrying end of the shoe and support a clamp engaging means in the form of a rod 51. The rod 51 is adapted to be engaged by a hook portion 58 (Fig. 2) of a catch 53 attached to the reciprocatory member. In order to force the catch 59 upwardly to bring the shoe member into close engagement with the reciprocatory member there is provided a lever 69 having a handle portion 5I and rotatably mounted on a shaft 52 carried in brackets 63 and 54 at one end of the reciprocatory member.

The lever 6D carries cam portions 65 adapted to engage the underside of the catch 59 when the handle is swung upwardly (clockwise) from the position shown in Fig. 2 to the position shown in Fig. l. To retain the catch in position there is secured thereto a bracket 66 having a slot 61 through which the shaft 62 extends. Thus the catch is loosely mounted on the reciprocatory member and is free to move in the slot 61 upwardly and downwardly with pivotal movement of the leverS. The central portion gof'the outer end of the catch 59 is bent inwardly as shownin Figs. 2 and 3 to engage a shaft 69 secured to the twin side pieces 59a and `llb forming a portion of the lever B0. The purpose of this arrangement is to limit the forward or counterclockwise movement of the lever 50 when the clamp is disengaged.

To mount the shoe on the reciprocatory member it is merely necessary to rotate the shoe from the position shown in Fig. 5 to bring its face into contact with the bottom'of the reciprocatory member shown in Fig. 4, The wedge face 53 of the dovetail 42' may then'be inserted into the undercut portion 52 of the plateV 59. This will bring the two members to the relative position shown in Fig.`2. The shoemay then be swung upwardly about the engaged dovetail and plate as a pivot until the lugs 45 and 45 enter the slots 3.1 and 33 respectively. At this point the hook portion 53 of the catch 59 will be adjacent to and just under the rod 51. By swinging the handle 6 l upwardly the hook engages the rod to force the shoe upwardly against the Ybottom The sides 33 and 49 of the slots 35 and 31 engage the wedge faces 48 and 41 respectively of the lugs to shift the shoe slightly to the left as shown in Fig. l to wedge the slanting face. 5 3 of the dovetail into the portion 52. This wedging action provides a very rm t or union between the shoe and the reciprocatory member. Longitudinal slippage between the parts is prevented bythe dual wedging action of the wedge faces 41 and 4B on the lugs and the wedge faces 52 and 53 on the dovetail and plate. In addition, the angular arrangement of the lugs and slots prevents transverse slippage between the parts.

It is', of course, clear that various types of rubbing material may be secured to the shoe 22. Thus for a ling operation, le sections may be formed integral with the shoe, or separate file sections may be screwed, bolted or otherwise secured to the outer sideof the plate 44. If abrasive material, such as sandpaper or emory paper is to be used, the clamping means 25 is Yused for clamping. a sheet of such material face portion '52 which extends transversely substantially the entire width of the shoe and is adapted Vto 'press' the sheet of abrasive material 24 into frictional engagement with f a -recess .14 provided ateach end of the shoe. l:The clamps "I0 are rotatably-and .removably mounted about the pins 'l5 (Fig. 5) mounted in pairs of brackets 16 v fixed vto 'the .plate 44. One such pair of brackets is provided at each end of the shoe. Each clamp is providedv at-eachend with a pair of, parallel lever arms i7 which extendinwardly and downwardly therefrom as shown inrv Fig. l. The inner army of each pair of lever arms H is provided with a slot lla which receives the pins l5. stretched between therpairs of lever arms at opposite ends of the shoe is ai resilient device such as a thick elastic band 18, the bands extending along each side of the shoe as shown in Fig. 5. The ends of the band are formed with a rounded portion le and a pin 8!) extends through a hole in the rounded portion of the band and through matching openings in each pair of lever arms. Each clamp is provided with a pair of linger actuating portions 8l to rotate the clamp about the rod 'l5 to lift the portion 'l2 away from the recess 74 as shown in the left-hand side of Fig. 1 to permit the insertion of the ends of the abrasive material 24 therebetween. Upon release of the linger pressure the tension of the bands 18 brings the clamping edge l2 of the clamp firmly against the abrasive material, as shown in the right-hand portion of Fig. 1, to hold it snugly in the recess.

I claim:

1. In a rubbing machine having a reciprocatory member, demountable rubbing means to be reciprocated by the member comprising a substantially rectangular shoe a pair of parallelogram-shaped lugs upstanding from the shoe adjacent one end thereof, each of said lugs having two sides extending substantially diagonally of the axis of reciprocation of the shoe, with the side toward the other end of the shoe having a Wedge face, a pair of complementary slots in the reciprocatory member adapted to receive the lugs, a plate olening an arcuate dovetail recess at said. other end of the shoe, a complementary dovetail on the reciprocatory member adapted to be inserted in the recess, clamp engaging means on the shoe, and a clamp carried by the reciprocatory member adapted to engage the clamp engaging means to force the lugs into the slots to wedge the dovetail in the recess.

2. In a rubbing machine having a reciprocatory member, demountable rubbing means comprising a shoe member, a pair of lugs on the shoe member adjacent one end thereof, each of said lugs being provided with a wedging face, complementary slots adjacent one end of the reciprocatory member adapted to receive the lugs, a dovetail on the reciprocatory member adjacent the other end thereof, a complementary dovetail recess on the shoe member adjacent the other end thereof and adapted to receive the dovetail, and lever means.. carried by one member and adapted to engage the other member to force the lugs into the slots to wedge the dovetail in the recess.

3. In a rubbing machine having a reciprocatory member, demountable rubbing means comprising a shoe member, a pair of lugs on one member adjacent one end thereof, each of said lugs being provided with a wedging face, complementary slots adjacent one end of the other member and adapted to receive the lugs, a dovetail on one member adjacent the other end thereof a complementary dovetail recess on the other member adjacent the other end thereof and adapted to receive the dovetail, and lever means 6 carried by one memberand adapted to engage the other member tov force the, lugs into the slots to wedge the dovetail in the recess.

4. .In a rubbing machine having a reciprocatory member, demountable rubbing means comprising a shoe member, a lug on one member having a wedging face, a complementary slot on the other member adapted to receive the lug, a dovetail on one member, a complementary dovetail recess on the other member adapted to receive the dovetail, and lever means carriedby one member and adaptedto engage the other' member to force the lug into` the slot to wedge the dovetail in the recess-v n 5. In a rubbing machine having a reciprocatory member, demountable rubbing means comprising a shoe member, locking means on the shoe member, complementary locking means on the reciprocatory member for engaging the rst mentioned locking means, wedgng means on one member and lever means carried by one of said members and adapted to engage the other member to force the members together whereby the Wedging means moves the locking means into interlocking relationship.

6. A demountable rubbing means to be attached to the reciprocatory member of a rubbing machine comprising a substantially rectangular shoe, a pair of parallelogram-shaped lugs upstanding from the shoe adjacent one end thereof, each of said lugs having two sides extending substantially diagonally of the axis of reciprocation of the shoe with the side toward the other end of the shoe having a wedge face, said lugs being adapted to t into complementary slots on the reciprocatory member, a plate defining an arcuate dovetail wedge-shaped recess at the other end of said shoe adapted to receive a complementary dovetail on the member, and engaging means on the shoe for engaging a clamp on the member to secure the shoe to the member to force the lugs into the slots and to wedge the dovetail into the recess.

7. A demountable rubbing means to be attached to the reciprocatory member of a rubbing machine comprising a substantially rectangular shoe, a pair of parallelogram-shaped lugs upstanding from the shoe adjacent one end thereof, each of said lugs having two sides extending substantially diagonally of the axis of reciprocation of the shoe with the side toward the other end of the shoe having a wedge face, a plate dening an arcuate dovetail recess at said other end of the shoe, engaging means on the shoe for engaging a clamp on the member to secure the shoe to the member, and clamping means on the shoe for clamping a sheet of rubbing material thereto.

8. A demountable rubbing means to be attached to the reciprocatory member of a rubbing machine comprising a substantially rectangular shoe, a pair of parallelogram-shaped lugs upstanding from the shoe adjacent one end thereof, each of said lugs having two sides extending subm stantially diagonally of the axis of reciprocation of the shoe with the side toward the other end of the shoe having a wedge face, a plate defining an arcuate dovetail recess at said other end of the shoe, and engaging means on the shoe for engaging a clamp on the member to force the lugs into the slots to secure the dovetail into the recess.

9. A demountable rubbing means for use with a rubbing machine having a reciprocatory member comprising a substantially rectangular shoe, a lug on the shoe having a wedging face adapted to engage the sides of Va complementary vslot on .the member, an arcuate dovetail recess adjacent one end of the shoe and adapted toengageacomplementary dovetail on the member and engaging means on the shoeV for engaging a clampv on the member to force the lug into the slot and tasecure the dovetail into the recess.

10. A demountabie rubbing means for use `with a rubbing machine havinga reciprocatory member comprising a substantially'rectangular shoe, a lug on the shoe having a wedging' face adapted to engage the sides of a complementary' slot'- on the member, a recess adjacent one end of the shoe and adapted to receive a complementary/fit- REFERENCES CITED The following references are of record lin the .le of this patent:

UNITED STATES' PATENTS Name Date Crosby Feb. l2, 1946 Number 

